43 lines
1.1 KiB
Markdown
43 lines
1.1 KiB
Markdown
# `sole()`
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The sole method returns the first element in the collection that passes a given truth test, but only if the truth test matches exactly one element:
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```js
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collect([1, 2, 3, 4]).sole(item => item === 1);
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// 1
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```
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If there are no elements in the collection that should be returned by the sole method, then an error will be thrown:
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```js
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collect([1, 2, 3, 4]).sole(item => item > 4);
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// Error ('Item not found.') is thrown.
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```
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If there are multiple elements in the collection that should be returned by the sole method, then an error will be thrown:
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```js
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collect([1, 2, 3, 4]).sole();
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// Error ('Multiple items found.') is thrown.
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```
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Like the firstOrFail method, you may also pass an attribute, operator, and value:
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```js
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const collection = collect([
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{ product: 'Desk', price: 200, discounted: true },
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{ product: 'Chair', price: 100, discounted: true },
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{ product: 'Bookcase', price: 150, discounted: true },
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{ product: 'Door', price: 100 },
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]);
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collection.sole('product', '=', 'Desk');
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// { product: 'Desk', price: 200, discounted: true }
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```
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[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/sole.js)
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